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Onkalo, on the other hand, is supposed to last 20 times as long as the pyramids have so far — so long that the builders of the site have to take into account the next ice age, when the weight of two miles of ice on top of Finland will be added to the stress on the buried waste containers, copper canisters two inches thick.

It might seem crazy, if not criminal, to obligate 3,000 future generations of humans to take care of our poisonous waste just so that we can continue running our electric toothbrushes. But it’s already too late to wave off the nuclear age, and Mr. Madsen’s film comes at a perfect time to join a worldwide conversation about what to do with its ashes. On June 3, administrative law judges from the Nuclear Regulatory Commission will begin hearing arguments about whether the Department of Energy can proceed with shutting down development of the Yucca Mountain site in Nevada, where the United States had been planning since 1987 to store its own nuclear waste.